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CVE-2026-33394— Discourse leaks PM post edits to moderators

CVSS 2.7 · Low EPSS 0.04% · P11
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I. Basic Information for CVE-2026-33394

Vulnerability Information
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Vulnerability Title
Discourse leaks PM post edits to moderators
Source: NVD (National Vulnerability Database)
Vulnerability Description
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, the Post Edits admin report (/admin/reports/post_edits) leaked the first 40 characters of raw post content from private messages and secure categories to moderators who shouldn't have access. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
Discourse 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是Discourse开源的一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse 2026.3.0-latest.1之前版本、2026.2.1之前版本和2026.1.2之前版本存在信息泄露漏洞，该漏洞源于帖子编辑管理报告泄露私信和安全类别中原始帖子内容的前40个字符，可能导致不应有访问权限的版主获取信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
discoursediscourse >= 2026.1.0-latest, < 2026.1.2 -

II. Public POCs for CVE-2026-33394

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III. Intelligence Information for CVE-2026-33394

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Same Patch Batch · discourse · 2026-03-19 · 17 CVEs total

CVE-2026-333556.5 MEDIUMDiscourse filters whisper posts from private-posts feed
CVE-2026-334105.4 MEDIUMDiscourse hardens chat DM channel creation and expansion
CVE-2026-274545.3 MEDIUMDiscourse has check revision visibility on posts endpoint
CVE-2026-333954.4 MEDIUMDiscourse has stored click‑based XSS via Graphviz SVG javascript: links
CVE-2026-320994.3 MEDIUMDiscourse prevents hidden profile data leak via user onebox
CVE-2026-333934.3 MEDIUMDiscourse fixes loose hostname matching in spam host allowlist
CVE-2026-271664.1 MEDIUMDiscourse vulnerable to HTML injection via prohibited iframe URLs
CVE-2026-334082.2 LOWDiscourse has Improper Authorization in "Post Edits" Report For Moderators
CVE-2026-27491Discourse has a bypass of official warnings messages by non-staff users
CVE-2026-27570Discourse Vulnerable to Stored XSS via Shared AI Conversation Onebox
CVE-2026-27740Discourse has Stored XSS in AI Triage Automation
CVE-2026-27934Discourse leaks private topic title and post excerpt via user action API endpoint
CVE-2026-27935Discourse leaks private topic metadata to non-authorized users
CVE-2026-27936Discourse discloses restricted post-action counts to non-privileged users
CVE-2026-29072Discourse missing permission check for policy creation in discourse-policy
CVE-2026-28282Discourse vulnerable to group membership addition permission bypass via discourse-policy p

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-200

V. Comments for CVE-2026-33394

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